The youth vote took center stage in Sunday’s Democratic debate as Hillary Clinton, Bernie Sanders and the low-polling yet persistent Martin O’Malley faced off one final time in Charleston, S.C., before the Iowa Caucus.

Featuring questions from YouTube stars and a focus on health care, college affordability and student debt, climate change and police violence – key issues Millennials care about, according to this USA TODAY/Rock the Vote survey – it was clear that a younger audience was in mind.

This should come as no surprise, though, since a 56% majority of voters under 35 lean toward voting Democrat, according to a Harvard Poll.

While shots were fired regarding Clinton’s relationship with Wall Street and Sanders’ attacks on President Obama (see the viral Bernie side-eye), the night was relatively heavy on policy and light on personal attacks, a stark contrast from Thursday’s GOP debate.

Wondering which issues discussed will matter most for Millennials? We’ve got you covered.

HEALTH CARE

What was discussed: The current Affordable Health Care Act and Bernie Sanders’ “Medicare-for-all” plan. Clinton worked to align herself with President Obama while Sanders suggested more drastic change, saying that the current system “leaves 29 million uninsured.” O’Malley brought up the all-payer system of Maryland.

CRIMINAL JUSTICE SYSTEM

What was discussed: Both Clinton and Sanders said something needs to be done about the current state of the criminal justice system, Clinton pointing to systematic racism and Sanders calling it “broken.”

Why we care: While Clinton’s “1 in 3” statistic on the incarceration of black men was slightly off, according to this fact check, there is a huge (and growing) disparity in the numbers of young people of color jailed each year. Ohio State University professor and lawyer Michele Alexander calls these statistics part of “the new Jim Crow laws,” as once a person spends time in the prison system, he or she is stripped of voting rights, job opportunities, financial growth and more.

CLIMATE CHANGE

What was discussed: Sanders said that the younger generation implicitly understands climate change and that “the debate is over.”

Why we care: Millennials have cited climate change as a top issue for the 2016 election, so the next presidential candidates’ views on the matter could heavily sway the vote.

YOUTH ENGAGEMENT

What was discussed: Answering a question from YouTuber Connor Franta, Clinton said that “this election is mostly about the future, and therefore, it is of the greatest urgency for young people.”

Why we care: While young people are “the most unreliable voters,” they also have a chance to make a difference in the 2016 presidential pick, and the Democratic candidates are taking note. Unfortunately, we didn’t get to hear much about these issues during the debate.

I have yet to see a substantial LGBT question at any of the debates. #DemDebate

The Republicans square off for a final time before the caucus in Des Moines on Jan. 28.

Oona Goodin-Smith is a student at Oakland University and a member of the USA TODAY College contributor network.

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